diff --git a/Source code/Encoding/Cipher/AES.cs b/Source code/Encoding/Cipher/AES.cs
index 8483a4b..a91bcc9 100644
--- a/Source code/Encoding/Cipher/AES.cs	
+++ b/Source code/Encoding/Cipher/AES.cs	
@@ -1,4 +1,9 @@
-using System.Security.Cryptography;
+/*
+Encoding - A mini tool to encrypt and decrypt a plain-text
+Copyright (c) 2015 - Nguyễn Tuấn
+*/
+
+using System.Security.Cryptography;
 using System.Text;
 
 namespace Encoding.Cipher
diff --git a/Source code/Encoding/Cipher/DES.cs b/Source code/Encoding/Cipher/DES.cs
index 58e4d0c..696c318 100644
--- a/Source code/Encoding/Cipher/DES.cs	
+++ b/Source code/Encoding/Cipher/DES.cs	
@@ -1,4 +1,9 @@
-using System.Security.Cryptography;
+/*
+Encoding - A mini tool to encrypt and decrypt a plain-text
+Copyright (c) 2015 - Nguyễn Tuấn
+*/
+
+using System.Security.Cryptography;
 using System.Text;
 
 namespace Encoding.Cipher
diff --git a/Source code/Encoding/Cipher/RC2.cs b/Source code/Encoding/Cipher/RC2.cs
index b9d4222..e515a99 100644
--- a/Source code/Encoding/Cipher/RC2.cs	
+++ b/Source code/Encoding/Cipher/RC2.cs	
@@ -1,4 +1,9 @@
-using System.Security.Cryptography;
+/*
+Encoding - A mini tool to encrypt and decrypt a plain-text
+Copyright (c) 2015 - Nguyễn Tuấn
+*/
+
+using System.Security.Cryptography;
 using System.Text;
 
 namespace Encoding.Cipher
diff --git a/Source code/Encoding/Cipher/Symmetric.cs b/Source code/Encoding/Cipher/Symmetric.cs
index d364e7e..08292b0 100644
--- a/Source code/Encoding/Cipher/Symmetric.cs	
+++ b/Source code/Encoding/Cipher/Symmetric.cs	
@@ -1,4 +1,9 @@
-using System.IO;
+/*
+Encoding - A mini tool to encrypt and decrypt a plain-text
+Copyright (c) 2015 - Nguyễn Tuấn
+*/
+
+using System.IO;
 using System.Security.Cryptography;
 using System;
 
diff --git a/Source code/Encoding/Cipher/TripleDES.cs b/Source code/Encoding/Cipher/TripleDES.cs
index ef2a116..6b1a8f8 100644
--- a/Source code/Encoding/Cipher/TripleDES.cs	
+++ b/Source code/Encoding/Cipher/TripleDES.cs	
@@ -1,4 +1,9 @@
-using System.Security.Cryptography;
+/*
+Encoding - A mini tool to encrypt and decrypt a plain-text
+Copyright (c) 2015 - Nguyễn Tuấn
+*/
+
+using System.Security.Cryptography;
 using System.Text;
 
 namespace Encoding.Cipher
diff --git a/Source code/Encoding/Hash/Hash.cs b/Source code/Encoding/Hash/Hash.cs
index 1849bf0..89b9285 100644
--- a/Source code/Encoding/Hash/Hash.cs	
+++ b/Source code/Encoding/Hash/Hash.cs	
@@ -1,4 +1,9 @@
-using System.Security.Cryptography;
+/*
+Encoding - A mini tool to encrypt and decrypt a plain-text
+Copyright (c) 2015 - Nguyễn Tuấn
+*/
+
+using System.Security.Cryptography;
 using System.Text;
 
 namespace Encoding.Hash
diff --git a/Source code/Encoding/Hash/MD5.cs b/Source code/Encoding/Hash/MD5.cs
index 406b533..744706e 100644
--- a/Source code/Encoding/Hash/MD5.cs	
+++ b/Source code/Encoding/Hash/MD5.cs	
@@ -1,5 +1,9 @@
-using System.Security.Cryptography;
-using System.Text;
+/*
+Encoding - A mini tool to encrypt and decrypt a plain-text
+Copyright (c) 2015 - Nguyễn Tuấn
+*/
+
+using System.Security.Cryptography;
 
 namespace Encoding.Hash
 {
diff --git a/Source code/Encoding/Hash/SHA.cs b/Source code/Encoding/Hash/SHA.cs
index 1de9d76..47d7c2a 100644
--- a/Source code/Encoding/Hash/SHA.cs	
+++ b/Source code/Encoding/Hash/SHA.cs	
@@ -1,4 +1,9 @@
-using System.Security.Cryptography;
+/*
+Encoding - A mini tool to encrypt and decrypt a plain-text
+Copyright (c) 2015 - Nguyễn Tuấn
+*/
+
+using System.Security.Cryptography;
 
 namespace Encoding.Hash
 {
diff --git a/Source code/Encoding/Hash/SHA256.cs b/Source code/Encoding/Hash/SHA256.cs
index c1a43ac..c15869b 100644
--- a/Source code/Encoding/Hash/SHA256.cs	
+++ b/Source code/Encoding/Hash/SHA256.cs	
@@ -1,4 +1,9 @@
-using System.Security.Cryptography;
+/*
+Encoding - A mini tool to encrypt and decrypt a plain-text
+Copyright (c) 2015 - Nguyễn Tuấn
+*/
+
+using System.Security.Cryptography;
 
 namespace Encoding.Hash
 {
diff --git a/Source code/Encoding/Hash/SHA384.cs b/Source code/Encoding/Hash/SHA384.cs
index affb10b..6760cb4 100644
--- a/Source code/Encoding/Hash/SHA384.cs	
+++ b/Source code/Encoding/Hash/SHA384.cs	
@@ -1,4 +1,9 @@
-using System.Security.Cryptography;
+/*
+Encoding - A mini tool to encrypt and decrypt a plain-text
+Copyright (c) 2015 - Nguyễn Tuấn
+*/
+
+using System.Security.Cryptography;
 
 namespace Encoding.Hash
 {
diff --git a/Source code/Encoding/Hash/SHA512.cs b/Source code/Encoding/Hash/SHA512.cs
index ebb5169..a39494a 100644
--- a/Source code/Encoding/Hash/SHA512.cs	
+++ b/Source code/Encoding/Hash/SHA512.cs	
@@ -1,4 +1,9 @@
-using System.Security.Cryptography;
+/*
+Encoding - A mini tool to encrypt and decrypt a plain-text
+Copyright (c) 2015 - Nguyễn Tuấn
+*/
+
+using System.Security.Cryptography;
 
 namespace Encoding.Hash
 {
diff --git a/Source code/Encoding/MenuButton.cs b/Source code/Encoding/MenuButton.cs
index d2020c4..2c7db5b 100644
--- a/Source code/Encoding/MenuButton.cs	
+++ b/Source code/Encoding/MenuButton.cs	
@@ -1,4 +1,9 @@
-using System.ComponentModel;
+/*
+Encoding - A mini tool to encrypt and decrypt a plain-text
+Copyright (c) 2015 - Nguyễn Tuấn
+*/
+
+using System.ComponentModel;
 using System.Drawing;
 using System.Windows.Forms;
 
diff --git a/Source code/Encoding/Program.cs b/Source code/Encoding/Program.cs
index da93bd9..c874c90 100644
--- a/Source code/Encoding/Program.cs	
+++ b/Source code/Encoding/Program.cs	
@@ -1,4 +1,9 @@
-using System;
+/*
+Encoding - A mini tool to encrypt and decrypt a plain-text
+Copyright (c) 2015 - Nguyễn Tuấn
+*/
+
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
diff --git a/Source code/Encoding/frmAbout.cs b/Source code/Encoding/frmAbout.cs
index ed575ca..11bae44 100644
--- a/Source code/Encoding/frmAbout.cs	
+++ b/Source code/Encoding/frmAbout.cs	
@@ -1,6 +1,10 @@
-using System;
+/*
+Encoding - A mini tool to encrypt and decrypt a plain-text
+Copyright (c) 2015 - Nguyễn Tuấn
+*/
+
+using System;
 using System.Windows.Forms;
-using Encoding.Properties;
 
 namespace Encoding
 {
diff --git a/Source code/Encoding/frmMain.cs b/Source code/Encoding/frmMain.cs
index 2779dc6..0e220f9 100644
--- a/Source code/Encoding/frmMain.cs	
+++ b/Source code/Encoding/frmMain.cs	
@@ -1,4 +1,9 @@
-using System;
+/*
+Encoding - A mini tool to encrypt and decrypt a plain-text
+Copyright (c) 2015 - Nguyễn Tuấn
+*/
+
+using System;
 using System.Drawing;
 using System.Windows.Forms;
 using Encoding.Cipher;